Tom,

The first batch of SR5 cards had a problem with their mmxc port.  Low or no output when selected.  The u.fl port was said to be ok.

If you don't mind, why would you use amps with a 400mW radio card?  I'd expect you to be overloading the input on the amps and making all kinds of noise....

Tom DeReggi wrote:
What exactly is the old mmcx problem? I had some original batch Range2's (or is that range 3s, the 2,4Ghz G ones) that were giving me sparatic performance at a site, used with RfLink Amps, and the mmcx port.
 
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
 
 
----- Original Message -----
Sent: Thursday, February 09, 2006 3:04 PM
Subject: Re: [WISPA] MikroTik 5.8GHz Radio cards and settings.

I was/am aware of the mmcx issue and all tests were done with the same u.fl pigtails on each end.  When the radio cards were changed, the same u.fl pigtails were used.  Only the radio cards were changed.

They were the older SR5 cards with the mmcx problem.  (proven by testing!!)  The mmcx port was down 6db from the u.fl port.

[EMAIL PROTECTED] wrote:
What pigtails and connectors? Mmcx on the SR5 or u.fl? are these new SR5's or
older sr'5s?

  
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf
Of Blair Davis
Sent: Thursday, February 09, 2006 2:08 PM
To: WISPA General List
Subject: [WISPA] MikroTik 5.8GHz Radio cards and settings.

Hey all:

I'm getting some odd results here with a PtP 5.8GHz link using MikroTik
that I setup to test with.  Let me describe the setup...

The link is 7.9 miles with clear LoS and clear Frenel zone.  Each end
has a 27db grid with a 3ft LMR-400 jumper to the MikroTik radio.

Using the link calculator at
http://www.zytrax.com/tech/wireless/calc.htm I get a predicted rx of
-60.8db at each end with CM9 radio cards (17db output).  Using the SR5
cards, (400mW), I get a predicted rx of -51.8

On to the real world results....  (all reading taken from the MikroTik's
winbox.  I am using version 2.9.11 on RouterBoard 230's)

With the CM9 cards, I get a measured rx of -62db, well within the margin
of error.  An interesting note here is that I must set the CM9's output
power in the MikroTik at 30db to get these results..  I know that the
MikroTik must be doing something odd with this setting, as the CM9 can
not put out 30db.  Reducing the setting drops the rx strenth by a like
amount.  This link is stable and will pass 30Mb/sec in UDP and 22Mb/sec
in TCP mode

With the SR5 cards, I get a measured rx of -66db, well outside the
margin of error and 15db below the expected rx strength!  An interesting
note here is that I must set the SR5's output power in the MikroTik at
30db to get these results.  I know that the MikroTik must be doing
something odd with this setting, as the SR5 should not put out 30db.
Reducing the setting drops the rx strength by a like amount.  This link
is stable and will pass 24Mb/sec in UDP and 16Mb/sec in TCP mode.

Nothing else is changed when I swap the SR5's for the CM9's or back
again.  I use the same antennas, cables, boards and pigtails.  The
antennas and cables are not moved between tests. (except for moving the
pigtail from one card to the other).

Can anyone tell me what I am doing wrong here?  Or do I just have some
bad SR5 cards?  Or is the tx power setting in the MikroTik flakey?  Or
is the tx power setting relative db not absolute db?

BTW, I will be changing one end to a sector and wish to use the SR5
cards then.  Otherwise I'd be happy with the -62 on the CM9's

Thanks in advance.

--
Blair Davis

AOL IM Screen Name --  Theory240

West Michigan Wireless ISP
269-686-8648

A division of:
Camp Communication Services, INC

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-- 
Blair Davis

AOL IM Screen Name --  Theory240

West Michigan Wireless ISP
269-686-8648

A division of:
Camp Communication Services, INC
    


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-- 
Blair Davis

AOL IM Screen Name --  Theory240

West Michigan Wireless ISP
269-686-8648

A division of:
Camp Communication Services, INC
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WISPA Wireless List: wireless@wispa.org

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